Nolan Grayson is a fictional character in the Image Universe, created by writer Robert Kirkman and artist Cory Walker (with Ryan Ottley) as an expansion of a character concept created by Alan Moore and Chris Sprouse. Omni-Man is the father of Invincible and Oliver Grayson, and a member of the alien Viltrumite race, working as a superhero on Earth. Omni-Man appears in Supreme, Invincible, Noble Causes, and Dynamo 5.
